Sometimes saying a "moderate A" can also be just a preparation for a more "ominous B".
Relocating a sadistic killer to a 5-star hotel is unlikely to solve the "conditions issue" and in all likelihood is bound to cause an even bigger outrage: "They just can't get it right.".
Indeed.
However, there are many ways of describing the fact that somebody is serving a sentence for a crime of which they have been convicted that does not need the tabloid thriller sensation of screaming "caged":
These include: Imprisoned, incarcerated, currently behind bars, serving a sentence, jailed......and so on. The language does not lack verbs - nor, for that matter does it lack a variety of verbs that are sufficiently descriptive, yet more than succinct and accurate, to describe this state.
Therefore, I think my concern with the use of the verb "caged" in this context is that this is a term more usually used to describe the condition of an animal that is behind bars, and thus, serves to dehumanise the person who may be serving (a fully justified) prison sentence.